Answer:
square root of 81
Step-by-step explanation:

so 9 is rational number.
the rest are irrational number
321 times 23 is 7,383
3,829 divided by 1,221 is (rounded to the nearest hundredth) 3.14
(the real number was: 3.13595414)
According to my calculations,
A. is the correct answer.
8√5
I'm pretty sure it's -4x.